OG11-Q78

78. Visitors to the park have often looked up into the leafy canopy and saw monkeys sleeping on the branches,whose arms and legs hang like socks on a clothesline.

可以通过排除法选择D.答案也是D.) seen monkeys monkeys sleeping on the branches, with arms and legs hanging

这是with短语做修饰状语吧?我对这种用法比较糊涂,从逻辑上,这里肯定是修饰monkeys,但是我想请教高人,从语法上讲,在这里不会造成with...即可修饰monkeys,也可修饰Visitors的可能性吗?为什么不是修饰主句的主语?谢谢指点!